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Please vote, watch and comment on these feature requests!
JRASERVER-68125 - Add a "Select All" option for checkbox custom field.
JSWSERVER-20989 - Select All Option for Associating Custom Field with Screens
JRASERVER-44441 - As an admin I want to be able to select all screens, using single checkbox, for Custom Fields
JRASERVER-65356 - Field Scheme configuration - Select/Unselect all check box
JRASERVER-13732 - Include a select all button or check box in custom fields' screens choosing
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